Phase Difference Pixel Layout to Reduce Color Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The phase difference pixel using the pupil division method experiences color mixing due to light scattering on the pixel separation surface, which is difficult to mitigate with existing reduction measures.
Innovation Solution
The imaging device incorporates a pixel array with a separation portion angled differently than 0 degrees relative to the column direction, reducing color mixing by altering the scattering pattern of light between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pupil division method is used to acquire phase difference, then autofocus control and parallax detection can be performed, but light scattering on the pixel separation surface causes color mixing between adjacent pixels
Solution Approach 1:
The patent applies local quality by making the separation portion have different properties in different regions. Specifically, the separation portion is configured to have different light shielding characteristics at different locations to selectively block scattered light while preserving direct light, thereby reducing color mixing in specific pixel regions without affecting overall phase difference detection capability
Solution Approach 2:
The patent introduces a separation portion as an intermediary element between adjacent pixels. This separation portion acts as a mediator that selectively blocks scattered light from reaching adjacent pixels while allowing direct light to pass through, thereby reducing color mixing without completely isolating the pixels and maintaining phase difference detection functionality
2Object-affected harmful factors
If conventional color mixing reduction measures are applied, then some color mixing is reduced, but it remains difficult to sufficiently reduce color mixing on the pixel separation surface
Solution Approach 1:
The patent applies parameter changes by modifying the configuration parameters of the separation portion, including its position, shape, size, and light shielding characteristics. By optimizing these parameters, the patent achieves effective scattered light blocking while maintaining sufficient light transmission for photoelectric conversion, thereby reducing color mixing without significantly compromising quantum efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively minimizes color mixing, improving quantum efficiency and phase difference acquisition while maintaining autofocus control, leading to enhanced image quality.
Implementation Method 1
a photoelectric transformation unit included in a pixel is divided by an insulated light shielding film
Data Source
AI summary
An imaging device according to an embodiment includes: a pixel array unit including a plurality of pixels arranged in matrix arrangement, in which a separation portion that separates a pixel with a separation surface to acquire a phase difference is provided at an angle different from 0 degrees with respect to a column direction in the arrangement in at least some of the plurality of pixels.